Micro-projector



Feb. 23, 1943.

J. B. WORTHINGTON EITALl MICROK-PROJECTOR Filed Sept. 5, 1940 2 Sheets-Sheet l 'Y EVM y v t \`20 L+ lNvlsNToRs c I Y n A'ITORN Feb'. 23, 1-943. J. B. woRTHlNGToN ET AL' 2,312,294

' MICRO -PROJECTOR Filed sept. s, 1940 2 sheets-sheet 2 A'ITORNEY memdreb. 23, 1943 UNITED' STATES PATENT or-FICE mcaolraomc'roa .rames Worthington una vacun- Bartley, Oklahoma City, Okla.

Application September 3, 1940, Serial No. 355,272 11 Claims.' (Cl. 88-24.)

onto a wall screen or the like for convenientlystudying the object.

And another object of this invention is to provide a micro-projector having a novel housing for anincandescent lamp of such construction that heat from the lamp is readily dissipated from the housing, and including a fan for circulating air within the housing assisting the dissipation of the heat away from the specimen unf der examination to facilitate an extensive study thereof.

And still an additional object of this invention is to provide a microprojector of such construction having an improved housing for an incandescent lamp wherein the lamp is mounted in an eccentric manner so that it can be moved to bring out certain parts of the specimen in line of direct focus for examination, at the same time blanking out the remaining parts of the specimen.

A further object of this invention is to provide amicro-projectcr having a housing for an incandescent lamp wherein said lamp is. eccentrically mounted and cooperates'with a reflector to provide an intensified light upon a particular portion of the object to be examined.4 The housing is of such construction to provide a housing cover' carrying the incandescent lamp piston which cover is eccentrically mounted with respect to the housing so as to increase the range of focus providing the intensified light if so desired.

And still a further object of this invention is to provide a micro-projector capable of producing an intensied light to effect a third dimensional projection of the specimen being enlarged in order to provide'a better outline of the projection and consequently eliminate considerable strain on the individuals eyes.

' a plurality of vknobs are separately placed on the lamp housing cover and the lamp piston. which when in alignment provide that the light rays are projected from a neutral position in direct line with the objective as distinguished from the eccentric arrangement providing a concentrated ray. v i

Other objects and advantages of the invention will be evident from the following detailed description read in conjunction with the accompanying drawings which illustrate one form of my invention. t

In the drawings:

Fig. 1 is a vertical longitudinal section taken through the instrument.

Fig. 2 is a view taken on lines 2-2 of Fig. 1

y with certain parts omitted for a clarication of And still an additional object of this invention j ,is to provide a micro-projector of such construe..

tion that access to all working parts for inspecthe eccentric construction of the lamp piston and lamp housing cover.

Fig. 3 is a detail view in front elevation of the strap supporting the fan.

Fig. 4 is a sectional view taken on lines 4 4 of Fig. 1.

Fig. 5 is a detail view of the knee Joint take on lines 5 5` of Fig. 1 with the knurled screw' shown in elevation. v

Fig. 6 is an enlarged detail view of the reflector reflected light rays.

Fig. 'l is a schematic view of the electrical wir-y ing arrangement for the instrument.

Fig. 8 is a perspective view of a modified form of the specimen plate.

Fig. 9 is a perspective View of a cover for the specimen View in Fig. 8.

Referring to the drawings in `detail and more particularly to Fig. l, referencecharacter 2 designates the base of the micro-projector which comprises a plate l horizontally supported upon suitable feet 6. A portion of the plate is formed or cast to provide an upstanding housing 8 disf posed at the' back of the base, and is open on its underside as. shown. In the central top portion of the housing 8 a threaded bossed opening ill is formed therethrough. The front and back walls'of the-housing 8 are each provided with a -control switch I2 and i4 respectively.

The horizontal forward position ofthe base 2. is adapted to receive the plate of porcelain i6 or other suitable white material which may be satisfactorily employed as a screen upon which an enlargement may be projected. The screen I8 is preferably secured to the plate by having its outer marginal edges bent to form guide ribs rent at a reduced voltage from a standard housing light circuit to theprojector lamp and fan to be later described. A conductor wire 28 provides electrical communication for the trans-A former I 8. The main switch I2 is connected with the transformer by wire 22 and controls the supply of electricity to the transformer. The switch |4 is a double toggle switch which can be operated for providing the secondary current of the transformer at either twentyor six volts, asis desired.

Wires 22 and 24 extend from the transformer into communication with the lamp and fan respectively. A wire 28 connects the transformer with switch |2. Referring to Fig. '7, the transformer I8 is/shown connected by the line 24 to the fan for supplying six volts thereto, all that is necessary for operation thereof. The switch I2 through line 22 can supply either twenty or six volts to the lamp bulb, depending upon the position of the switch I2. In Fig. 7 the electrical lead line to the lamp is not shown. The lamp and fan are grounded to the frame of the instrument -as illustrated so that the circuit will be completed as will be readily understood.

Secured ln the bossed opening I8 is a vertically upstanding tubular shaft or standard 28 through which a portion of the wires 22 and 24 passes.

'Ihe upper end of the standard 28 is provided with a head 38 secured thereto by a suitable set screw 32 and the head 38 is provided with an aperture Y 32 through which extends the wires 22 and 24. The head 38 projects laterally from the standard 28 and is provided with an aperture 38 in which is secured a sleeve or tubular shaft 38 extending upwardly above the head 38. The lower end of the shaft 38 is closed by a suitable plug 48 secured thereon by a screw 42, and it will be apparent that the sleeve can be adjusted in a rotary path.

From the foregoing it will be apparent that the device does not provide for any vertical adjustment of the projector at this point. However, the standard 28 is of such a height to compensate for any enlargements, and vertical adjustment is made through the elements mounted on the mast to be later described. The upper end of the sleeve 38 has secured thereto by means of a screw 44, a laterally extending arm 48 formed with an enlarged circular portion 48 comprising part of the knee joint shown more clearly in Fig. 5. The portion 48 is adapted to cooperate with a similar portion 82 providing a dual joint held together by a knurl headed screw 82 extending through aligned apertures 84. The knee joint provides for disposition of the lamp and housing in a horizontal plane to project the specimen on a wall or the like. The portion 88 extends laterally to provide an arm 88. the outer end of which is integrally formed with the lamp box housing 88. It will be understood that the housing, although illustrated as integralwith the arm 88, may be formed separate therefrom by. any suitable means such as that shown in applicants co-pending application, Serial No. 307,322 heretofore mentioned. The lamp housing 88 is shown in the form of a vertically disposed elongated body of substantially irregular shapel in cross section (Fig. 4) to provide an increased space to allow for dissipation of heat by thelamp. The outer periphery of the housing 88 is provided with a plurality of encircling or partially encircling ribs orflns 88.

As clearly shown in Fig. 4, the ribs 88 are intersected by a plurality of spaced vertical grooves 82 which in cooperation with the iins 88 provide for further dissipation of heat from the walls of the housing 88. The upper portion of the lamp housing 88 is'provided with an aperture or opening 84 for receiving a lamp box cover 88. The

cover 88 is provided with a pair of outwardly` depending spaced circular flanges 88 and 18 respectively. The flange 88 is adapted to fit in the opening 88 of the lamp box and is formed slightly eccentric with respect to the concentric opening 12 (Fig. 2) provided by the inner periphery of flange 18. The eccentric arrangement of the flange 88 on'the cover .88 will be hereinafter set forth. The cover 88 is held in position in the housing by a suitable screw 14. The flange 18 extends outward from both sides of the cover 88 to provide an upwardly extending portion 18, and an extension of the concentric opening 12. A tubular lamp carrier piston 18 is disposed in the opening 12 and extends vertically downward into the interior of the housing 88. A suitable friction fiber member 88 forced inwardly by a spring 8| and screw 82 holds the tubular cylinder 18 in position. A knurled ring or collar 84 is secured to the top of piston 18 by a screw 88 and acts as a handle for the piston. A suitable cap is fitted in -the piston'and is provided with ventilator openings 88, and an aperture 82 for receiving wire 22 extending downward through the piston 18 into the lamp socket now to be described.

The lower half portion of the tubular lamp piston 18 is formed to provide an eccentric bore 84 as clearly shown in Fig. 2. The eccentric bore is off set with respect to the outside diameter of the piston 18. A bayonet type lamp socket 88 is arranged in the eccentric lower portion of piston 18, and has a suitable insulation disc 98 receiving wire 22 and urged forwardly toward the outlet end of the socket by a helical spring |88 anchored therein, which is usually maintained partially compressed when the base of the incandescent lamp |82 is secured in the socket 88. The lamp is of any suitable type having a bayonet connection for interfitting in the socket 88. A circular reflector |84 is integrally. secured to the lower portion of the socket 98 and extends outwardly therefrom. As clearly shown in Fig. 6, the marginal edges of the reector |84 are provided with bent or angled portions |88 providing a reflector of different radii for a purpose as will be hereinafter set forth.

The horizontal back portion of the housing 88 is provided with an aperture |88 for receiving the circular fan II8 for a purpose as will be hereinafter described. The aperture |88 is covered by a plate II2 in which the apertures II8 are vformed i at angles in order to admit air, yet exclude direct light rays. The plate is secured to the housing by screws II8. The lower end of the housing 88 is formed to provide an axially directed sleeve I I4 in which is secured a suitable lens system I|8 by means of screw II8. It is to be understood that the aperture provided by the sleeve I I4 is in substantially axial or vertical alignment with the concentric aperture 12 of the cover plate 88. A circular collar II8 containing a heat radiating disc |28 is secured to the lowermost end of sleeve ||4 by a plurality of circumferentially spaced screws |22. The disc |28 retards head of the lamp away from the specimen and allows for an extensive study thereof. The forward side portion or the-housing 5 9 is provided with an aper- Y ture |24 for receiving a circular baiile member t28 mast i3d. As clearly shown in Fig. 3, the motor 10 |32 for the fan ii@ is supported by a strap or band |318 suitably held' or clamped on the mast |30 by a bolt i3d. A specimen stage it@ is supported on the mast |30 directly beneath the lens system MG, and immediately below the specimen A sleeve i5@ is yformed integral with the speciv men stage plate is? and has an ams parallel with the axis of aperture |46. This sleeve has anonlarged back portion in which are housed a pair 3g ci gearJ pinions 52 and |54 meshed with one another, and the pinion |52 has its periphery projecting into the sleeve i@ lwhile the pinion idd is carried on a shaft supporting a lsnurled adjusting wheel, neither oi which is shown. The sleeve 35 it@ receives an inner sleeve idd through which the mast i3d extends, and the sleeve |56 is provided with s, longitudinally .extending tooth rack iti@ with which the pinion it? meshes. The upper end of the rack sleeve |56 is provided with a head i6@ which carries a brake comprising a frictional member 62 forced inwardly by a spring itt and screw |66 for engaging the mast iaand holding 4the rack sleeve and specimen stage on the mast.

It will be apparent 'that by the friction brake a 'rough vertical adjustment of the Specimen stage may be made and after completing such rough adjustment, a iine adjustment of the stage can be the mast i3d. A friction brake ile similar to thaty utilized for the specimen stage holds the objector stage its in position on the mast i3d.

The usual dat slide or specimen plate (not shown) is utilized in projecting still specimens. However, in Fig. 8 a mcdied iorm ci' specimen plate is 'shown when itis desired to project live specimens, especially insects or the like normally @5,

living in water, so that observation can be made of the'insects free and natural movements. The

plate iid is provided with aV transparent rectangular shaped box llo lsecured. to the plate by glue or the like. 1n Fig. 9 is shown a transparent cover itil for the box E13. It will be apparent that the box can be formed in any shape desired and in a lateralprojection of the specimen on a wall or the like an end portion of the box il@ may act as the cover plate.

lo stage an objector stage it@ is supported on the Operation In operation when it is desired to project a specimen on the screen i8, the switch It controls the supply of electricity from the dual trans former it to the lamp i2, whether it be twenty or six volts required. A switch |82 controls op eration of the fan iid. The collar de, cover plate d@ and lamp housing da are each provided with screws ist, ted and itt respectively, which when in vertical alignment project a direct ray centrally focused from lamp @d2 through lens |56 to the specimen stager M2. it will be understood in this type of projection that the lamp piston 'la is in its lowerincst downward position as determined by collar 3d contacting the top of ilange 76. The direct ray provides a pure white intense circle of light for observing an over all view on the screen i6. It will be understood that the fan lill is circulating air in the interior of the housing 5d to be discharged through bane lit. The circulation oi' cool air cooperating with the cooling iins low an intensive study of the specimen on the 25 stage it.

' When it isdesired to observe a particular part ci' a specimen, theV light can be moved within the ,optical axis of the objective/@disclose any part oi the specimen' with a sufrstantially concentrated ray of light` lThis eliminates moving the specimen plate for this purpose. The eccentric arrangement of the lamp piston ld cooperating with the angled rim lddof the reflector tilt creates a concentrated ray of light, in that upon vertical upward movement of the adjustable piston 18 the ecccntricity of the piston allows focusing of the ray at a particular part of the specimen desired to be observed, simultaneously blanking out the remaining parts. This movement of the piston @0 i8 in cooperation with the reflector directs the tric arrangement of the lamp yhousing cover 6o allows for increasing the range of focus of the and rotating cover 66 as desired.

From the foregoing it will be readily apparent that the micro-projector herein described is'of a simple and compact construction for facilitating access to the .working parts for inspection, replacement or the like, and that the projector can by adjustment in conformity to the alignment of screws itt, @do and its supply an over all direct ray of intense white light, or by adjustment of piston lil, a concentrated light to a particular part ci? the specimen'heing enlarged, while si multaneously blanlsing out the remaining parts of the specimen, in order to eliminate eye strain and the like, and present a Kbetter disclosure of theobject. The light rays can be laterally varled twith respect to the normal optical axis to include a larger portion of the particular part oi the specimen being observed. The projector is of such construction that circulating cool air i is present in the lamp housing which in conjunctionv with the radiating nos of the housing and heat retarding discs dissipates considerable heat 'created' by the lamp so that an extensivestudy of a specimen can he made. f Furthermore, the linee joint construction allows concentrated ray by merely loosening screw le i'or adjustment of the lamp box housing to direct a ray of light against a specimen 'in a horizontal plate so that a projection may be made upon a wall or similar vertical screen without the use of a reflecting mirror or other similar device for this purpose. The use of the glass receptacle for live specimens allows for a horizontal projection of such object. Furthermore, the disposi- Changes may be made in the combination and arrangement of parts as heretofore set forth in the specification and shown in theA drawings, it being understood that any modification in the precise embodiment of the invention may be made within the scope of the following claims without departing from the spirit of the invention.

What we claim is:

1. In a micro-projector including a housing, an adjustable piston vertically arranged therein, a lamp carried by the piston, a condenser lens adapted to cooperate with the lamp, an objective mounted to cooperate with the lens, a specimen stage mounted to cooperate with the lens and objective, a reector for the lamp, said reflector having an angled outer rim portion directing the reilected light of the lamp into the lens in a Y converging vertical and lateral condition.

2. In a micro-projector including a housing, ean eccentrically mounted cover therefor, an ad-- justable piston carried thereby, an eccentric bore provided in the piston and adapted to receive a lamp socket, a lamp disposed in the socket, a reture, a centrally disposed aperture in thecover ilector carried by the lamp socket, a lens adapted to cooperate with the lamp, said reilector responsive to an adjustment of the piston to direct a converging vertical and lateral rays 0f light to the lens, and said cover adjustable to laterally vary the focus of the reflected light.

3. In a micro-projector including a housing,

a cover therefor, an adjustable cylinder carried by the cover, a' lamp carried by the cylinder, a condenser lens adapted to cooperate with the lamp, an objective mounted to cooperate with the lens, -a specimen stage, a specimen supported by the stage, and means responsive to movement of the cylinder for directing the lamp rays to a limited portionof the specimen and simultaneously blanking out the remaining portions of the specimen, and means cooperating with the last mentioned means to provide a concentrated light, said cover adjustable to laterally vary the rays on the specimen.

4. A micro-projector including a housing, an

adjustable'piston carried thereby, a lamp carried by the piston, a condenser lens adapted to cooperate with the lamp, a mast arranged in parallelalignment with the lens, a circulating fan providing air for the housing, a fan motor supported by the mast, a light precluding means carried provided with radiating ilns formed by horizontal and vertical grooves adapted to cooperate with the fan for d issipating heat from the lamp.

5. A micro-projecto;- including a housing, an adjustable piston carried thereby, a lamp carried by the piston, a condenser lens adapted to cooperate with the lamp, a mast'arranged in parallel alignment Vwith the lens, a circulating fan providing air for the housing, a fan motor supported by the mast, alight precludlng means carrledby 6. In a micro-projector including a housing. Y

an aperture in the uppermost portion thereof, a cover plate eocentrlcally arranged inthe aperdisposed in the socket, a reilector carried by the lamp socket; a lensI adapted to cooperate with the lamp, an objective mounted to cooperate with the lens, a specimen stage mounted to cooperate with the lens and objective, a specimen supported by the stage, said lamp responsive to a vertical l and rotative adjustment of the cylinder to direct a ray of light to a limited portion of the specimen while simultaneously blanking out the remaining portions of the specimen, said cover plate rotatably adjustable to laterally vary the light ray emitting from the lamp.

7. In a micro-projector including a housing. aperture in the uppermost portion thereof, a cover plate eccentrlcally arranged in the' aperturel a centrally disposed aperture in the cover plate, an adjustable cylinder arranged in the cover aperture, means for adjusting the cylinder, an eccentric bore provided in the cylinder, alamp socket arranged in the eccentric bore, a lamp disposed in the socket, a reflector carried by the lamp socket, a lens adapted to cooperate with the lamp, an objective mounted to cooperate with the lens, a specimen stage mounted to cooperate4 with the lens and objective, a specimen supported by the stage, said lamp responsive to a vertical and rotative adjustment of the cylinder to direct a ray of light to a limited portion of the specimen while simultaneously blanking out the remain- -ing portions of the specimen, said cover plate roan aperturein the uppermost portion thereof, a

Vby the housing for emitting air', said housing Y cover plate eccentrically arranged in the aperture, a centrally disposed aperture in the cover plate, an adjustable cylinder arranged in the- ,cover aperture, means for adjusting the cylinder, an eccentric bore provided in the cylinder, a lamp socket arranged in the eccentric bore, a lamp disposed in the socket. a reflector carried by the lamp socket, a lens adapted to cooperate. with the lamp, an objective mounted to cooperate with the lens, a specimen stage mounted to cooperate with the lens and objective, a specimen supported by the stage, said .lamp responsive. to a vertical and rotative adjustment of the cylinder to direct a ray of light to a limited portion of the specimen while simultaneously blanking out the remaining portions of the specimen, said cover plate rotatably adjustable to laterally vary direct light into the lens in converging vertical and lateral condition, and separate means carried by the housing, cover and piston and adapted when in alignment to indicate a neutral light.

9. In a microscope projector comprising a base having a horizontally disposed at portion and base having a horizontally disposed ilat portion and a housing at one side of the nat portion, a

vertically disposed tubular standard secured at one end in the top of said housing and extending vertically therefrom, a head secured to thev upper end of the standard 'and having a verticalin the guide and maintained in parallel relation with the standard, an outwardly depending arm secured to the sleeve, a second arm cooperating with the first mentioned arm to form an adjust-y y able joint, a vertically disposed lamp housing v secured to the second arm, said joint capableof adjustment for moving the housing to a horizonv tal plane. y

11. In a micro-projector including a housing,

Van adjustable piston arranged therein, a lamp carried by the piston, a condenser lens adapted` to cooperate with-the lamp, an objective mounted to cooperate with the lens, a specimen stage, a specimen supported by the stage, reflector means` so constructed and-arranged in response to axial rotative movement of the piston to provide a con centrated two-power ray of light to the specimen, p

andl means eccentrically adjustable tolaterally vary the ray of light with respect to the specii men.

` JAMES B.l WORTHINGTON.

VICTOR BARTLEY.

ly disposed vguide therethrough, a sleeve secured 

